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4 channel audio

Question

I have an AVI file that contains 4 channel AC3 audio. Also have ac3filter installed, active, and working. If I set the encoding to stereo it encodes fine. If I set it to the next closest thing, "5.1" it errors with unknown error.
How am I supposed to encode 4 channel audio?

Thanks.

JR

EDIT: By the way, my existing 4 channel audio is AC3 448Kbps, 48Khz, 16 bits. That said ac3filter is set to "no change" on the filter but do not see a say 4.0 audio setting on the codec anyway as a choice.

All replies

By the way, over 200 hits and no responses. Thought I would provide some additional information. From what I have been researching this seems like a 3.1 audio source. I think it's left, right, center, and I think sub since that's the .1.